Apparatus for forming a hedge shear blade



Jan. 2, 1940. w. E. BARNHART 2,185,881

' ,APPARATUS FOR FORMING A HEDGE SHEAR BLADE Filed Oct. 14, 1937 v Sheets-Sheet 1 Y P1 1. n-

W ,I I In .01 41. ill. P361349 INVENTOR William E Bar/wharf H 1:; ATTORNEY.

10 bevelededgej oir nedfleitherlby forging orummm f; larly to and z lI'fhave shown g nerall t 10" 25 apparatiis'; the" 'tion' itself will beconie ingre'as'in'gly 'appareht'ifrorh Pateiited.lan.2,1940; l a 51.

' UNlTE-D-STATESPATENT -QFFHEE' I I I 2-, 185,8 81 t 7' 1". Arrlum'rii's For; i-b'imimi William EJBarhhart, Per h Amboy, N.-Ja; assign.-

or, by mes'neassi'g'nmentsyto Ilie 'American '7 Fork & oe Company, cleveland, Ohio; col? n a i nof-ohio U ig. 7 is a pl anviewfoif' a'eutt'erblank and stop and the lik m ep il'rt l larly to an improved] elen eh't whiehl'may employ; f Q

method and pa for'forrning' the bevel edge Fig. 8 is a fragmerrtary seetiori'taken alone the of the blade, "1ine 8 8-of"F ig.7"; I v

usually rmed of elied s y re ta i' e neit n .'.9. of Fi -J a ,1 ular in rps w n Kfirb l i u al d e; i -11 s aeie lfiiewq t ei hearl d rb nki This appli'c f latstoii dg shear blades l operationflgoth o filthese methods being relatively H) a shear'b expensive due to the time involved, I

formed relatively Quicklyand eppnomieallyj by fwithphe endisqliareand the other eri da ng'ularly 1 I punching operati iiivolvi 'gh-shea'ring the ldispqsed so hata negligible 'arnount of mate'rial beveled edge; V erablythe shear blade 'blankat shearir guthgb y a the angularly d1sposeclfend has a relatively short" portion extendiri atri glitanglesto the'lohgitum3 m r hpi fgm y f ng-ther e l v is to provide an impro eld m lthqdiandflapfiaratus "din'a l end ofl'the' lank'asindicated at l2. 'This forforming'thebevele d. edge efhed gesliearblades J pro'vids anio'r desirable eohstriietion r ojriji'the a the like" standp nfijbf, lfi fi hd a' f he t r i ention tgfp'r ovide" theshears' and orsi 'bseqiientif sliarbening as Another object ofm" I @fshea blades and comfiared we V-f-fioihti y the like quiolgly'ja ndjecgriqmibally j H .The blanl; lp is the"'inserted,;i n' 'adie or similar Another obi invention ,po ,pr mg w rk 110mm; p mmsrgeeemw iiidi'eatd "at" apparatus'io'r'iornu g hed 'earblade or the" 1 l3, eoiiiprisi'nga'dieshoeilfijhavinga planeba'se' 'f like by'pun'ching operation r f ncluding lslotted endportions, indicated arm-,1"

80 b eqt.,qi.mr P t eim de whereby h e fs b' ir' e v e a an improved die or jixtiii e jfor holdingfa edge support byji'i oj ecti ng bolts t'hrough the slots l5 shear blade or tlie; like"'while'forniing' a bev'eled- "'or. in any'isuit reanner; Thedie 'shoe Mfis edge thereoi1 l f W h I recessed to provide longitudinally"extending side Another object pjf rny-inveritiogi is 0 provide walls [$5 arid Tla nd'an in ermediate recessed p or- I a relativelyrngged'die'orii' turepsed fprrnir g tiofi o'f" steb foim baseeprnprising a sieeed por m shear blades e omprisinga a arjgs hj rnay be tion 20', "a Qgilqbed crit'ral'portidii Zlfand a hori-' quickly and -easi ly disassembled ml reislacehient zon'tal-.portiori" 22.f[K longitudinally extending or repair. l shoulder 2'3'ith'1'isiormd'intermediate the'slopf" 'j' 'rwq ldhg'itudinally' ex:

Other objects; of invention and the inven- 'lingf fio' tiofi s" 20 an 2]; I

v f jtendin'g aiicl"g'erierally rectang i lar'perforations 40 {at} a, considerationfif' the To owing description a'iid indiatd 9,1;24"atidf25eiitend from the sloping drawings wherein: a a A 4M portions Zlfa'r'id'Z'l Yespectively'tliroiig h the base Fig. 1 isa plan'yievv' a shear;blade blanlg oftli die she, lijprforationsterminatinglon which I may employpr or tqhaviiig the cutti'ng gitiidi'fi'ally'as"indicated alt'flyan'd 21. w 5 edge formed thereonij 5 a A eutter blade'23 i's' supported on'the sloped 5"" Figs. 2 and 3 are plan and ele ationalviews portiofi' 2Q and is"1ongitudinally" 'ed exterisive respectively qf'the blank of Figffprovidedwith therewithfth fend 'pQr'tiQn's of'the 'cl'itteifblade' 'a cutting edgef "j g being substantiaHybIithe 'saineiwidthasfthe'slop l Fig. 4 is a bianv eyv'o f a di "apbaratlis 'whieh ingQpbitiQnZ'O'aiid'the intermediate'bladeportion I may en gl oy. fpr'lprovidin'g a c'iittin'g edge on being" slightly 'ciit'b'aqk' ma ver ical plal lfletfid g o 1'- the blank; w u v i alonga lorigiiz'i cliria1- 'ed'g'ea's indieatd'atPZS for Fig. .5 is an end elevational view of the a ppaa pur'fio'se to'be l'atr'des'c'rib A work rest g'enratus of Fig'.'}j; h y eral lyi ndicated at'30 iss' ipe phsed'onthe'butter" Fig. 6 is a sectional viewt'aken alongthe 11m blade 28 aridfis "maintained ther'eofiby a' ho'ld to the inclined face 32 of the work rest.

A second relatively thick cutter blade 38 is supported on the central slope portion 2| and against the vertically extending shoulder 23 of the die shoe l4. 0nd work rest 33, having a longitudinally extending inclinedface 43 preferably inclined at sub stantially the same angle as face 32 of work rest 30, the work rest 39 also being providedwith a longitudinally extending groove ti in the top face thereof within which is seated flange 35 of a second-hold down clamp 3L Supported on the horizontal portion 22 of the die shoe and abutting cutter blade38 is a punch-backing ele ment 42 generally rectangular in cross-section.

The work rest 39 andcutter blade 38 have one longitudinal edge portion recessed as indicated at 43, to cooperate with the cut back portion 29 of cutter blade 28 to form a generally rectangular opening therebetween corresponding to the perforation 23 through the base of the die shoe l i.

, The opposite longitudinal edge of cutter blade 38 is a cut back as indicated at M to cooperate with a recessed portion of punch-backing element l! as indicated at 45 to form a second generally rec tangular opening therebetween corresponding to the second perforation 25 of the die shoe l d. The

shear blade blank It may be projected between the work rest 30 and hold down. clamp 3!, whereby it will be supported intermediate the inclined face 32 of work rest 30 and face 31' of the holddown clamp 3| to overhang the cut-back portion or edge 29 of the cutter blade 28. The overhanging portion of the blank Ill or the portion extending into the rectangular opening is of generally -forrn and after the shear blade blank Ed has been projected axially within the die shoe I l a predetermined amount, it may be operated on by a generally rectangular punch 50 which is vertically reciprocable to rough shear the overhanging V-portion of the blank. The punch 53 may be operated in a well known manner by a fly wheel or the like to subject the blank to the shearing operation and I have found-that. the over-hanging v portion. of the blank is only partially sheared and the remainder of the overhanging portion is broken off, resulting in a,

rough. surface. To provide a desired finished surface, shear blank it! is withdrawn from the die shoe and reinserted, being supported on the inclined face of work rest 33, or in the right hand position, as viewed in Fig. 4. In this position, the previously sheared surface preferably overhangs the cutter blade to a slight extent whereby the surface may be cleanly finishsheared by a second punch 5! due to the relatively small amount of material which must be removed.

Preferably two shear bladeblanks are disposed in the die shoe at one time and operated on simultaneously by the punches 53 and 5! to rough shear one blank and finish shear a second blank. Although I preferably punch or shear two blanks superposed on cutter'blade 38 is a secindicated at 32 to clear the punch 50.

at once, it is apparent that any desired number may be concurrently operated upon by providing a die shoe of proper size and rigidity.

The waste sheared material will be forced through the perforations 24 and 25 provided in [the die shoe, and collected in a container beneath the die shoe support.

The work rest 33 and the punch backing element 42 may be securely maintained in position by bolts 55 projecting through the lateral walls l6 and ll of the die shoe and threadedly engagfingthe 'work'rest 3G and punch backing element 42. The cutter blade 33 and the work rest 39 may be maintained in proper relation by a key 55 secured to the cutter blade and projected within a recess providedtherefor in the work rest. The

work rests 3iland' 39 and the cutter blades 28 and. 33 may be rigidly secured bybolts 51 pro- 'jected through the base of the die shoe and the l cutter blades and threadedly engaging the work rests. The heads of bolts 5'! preferably being head. The hold. down clamps '3! may be secured recessed in a contour bore in thebase of the die to the work rests 30 and 39 by bolts 58 projected through the hold-down clamps andthreadedly engaging the work rests.

Referring now to Figs. 7 and-8, I have shown the work rest 33 with a stop element 60 adjustably mounted to. position the blanks, for operating thereon The element 38 is preferably formed of the same material as the: hedge shear blank and has an inwardlyextending edge 6| angularly .cut to abut the edge H of blank 50. Also the longitudinal edge of the element 60 is beveled as The element 63 is provided with a plurality of perforations 33 to receive a bolt 64 adapted to be projected throughthe upstanding leg 65 of an angle member 66 andsecured thereto by a nut 67. The stop element can, be longitudinally adjusted to permit blanks l!) to be projected varying dis- .tances into the'zone of contact with punch 53. v A second stop element 69 may be secured in a similar manner to work rest 39.

The other leg 68 of angle 66 is rigidly secured to sloped portion 23 ofthe die shoe beyond the end of the work rest 30 and cutter blade .28 by bo1ts 69. Thus, the stop element 33 may be adjusted without disturbing the assembled work rest and cutter blade;

Referring to Fig. 9, I have shownan arrangement for guiding the blanks into the die comprising an angle. element ill secured to the die shoe by boltslland having an upstanding leg 53 to which a small angle element 14- is rigidly secured by rivets or the like 15. The blank will be cradled between the upstanding leg 73 and the,

horizontally extending leg of element M forwardly of the work holder 33, cutter blade ,28 and hold-down clamp 3! and in proper alignrnentto be projected into operative position against the stop element fill.

Although I have found that two punching oper-- ations are sufficient for shearing material from the blanks, I contemplate that three operations may be desirable in which event a second work rest 30, cutter blade 23 and hold-down clamps would be provided between-the work rests 3B and 39 shown and the initial punch would not be as heavyas in the present instance. p

I preferably polish the sheared surface of the blank or blade upon removal from the die and grind to the lower longitudinal edge, Fig. 2, which rests on the cutter blade during thepunching operation. v

Although I have shown and described a preferred form of my invention, I contemplate that numerous and extensive departures may be made therefrom Without departing from'the spirit of my invention or the scope of the appended claims.

Having thus described my invention, what I claim is:

1. Apparatus for forming hedge shear blades and the like comprising a die having a recess therein for slideably receiving a reciprocal punch element generally rectangular in cross-section, means for rigidly and removably supporting a shear blade blank inclined at an angleto the direction of motion of the punch element and with a portion of the blank extending over a longitudinal edge of the recess in the path of the punch element and means for maintaining the punch element in contact with the blank during the punching operation.

2. Apparatus for forming hedge shear blades and the like, comprising a die having a generally rectangular recess formed therein to slideably receive a reciprocable punch element generally rectangular in cross-section, a cutter blade of relatively hard material supported above the recess on the die and formed to substantially align with a longitudinal edge of the recess, a support member above the cutter blade having an upwardly inclined face engaging the cutter blade along a line parallel to said longitudinal edge and slightly spaced therefrom and means for rigidly and removably supporting a shear blade blank against the inclined face of the support member with the blank edge portion engagingthe cutter blade and with a portion of the blank V-shaped I a plurality of blades in cross section extending beyond said longitudinal edge in the path of the punch element.

3. Apparatus for forming hedge shear blades and the like, comprising a die having a generally rectangular recess therein, a punch element generally rectangular in cross section mounted to 'slideably reciprocate in said perforation, a cutter blade disposed above the perforation on the die and formed to have a longitudinal edge thereof align with a longitudinal edge of the recess, a Work rest element abovethe cutter blade having an upwardly inclined face engaging the cutter blade along a line parallel tosaid longitudinal edge and slightly spaced therefrom, a clamp element having a face disposedparallel to the inclined face of the work rest element whereby a tudinal wall of the recess to guidingly support the punch element during the punching operation.

4. The apparatus described in claim 3, and

wherein a plurality of said recesses are provided in the die, together with a plurality of punch elements, cutter blades, work rest elements, clamp elements, and punch backing elements whereby ated upon.

WILLIAM BARNHART.

may be concurrently oper- 

